C++ TriangleBuffer::triangle方法代码示例

//-----------------------------------------------------------------------
void Lathe::_latheBodyImpl(TriangleBuffer& buffer, const Shape* shapeToExtrude) const
{
	int numSegShape = shapeToExtrude->getSegCount();
	assert(numSegShape>1 && "Shape must contain at least two points");
	int offset =0;

	//int numSeg = mClosed?mNumSeg+1:mNumSeg;
	int numSeg = mNumSeg+1;
	buffer.rebaseOffset();
	buffer.estimateIndexCount(numSeg*numSegShape*6);
	buffer.estimateVertexCount((numSegShape+1)*(numSeg+1));
	
	Radian angleEnd(mAngleEnd);
	if (mAngleBegin>mAngleEnd)
		angleEnd+=(Radian)Math::TWO_PI;

	for (int i=0;i<numSeg;i++)
	{
		Radian angle;
		if (mClosed)
			angle = i/(Real)mNumSeg*Math::TWO_PI;
		else
			angle = mAngleBegin + i/(Real)mNumSeg*(angleEnd-mAngleBegin);
		Quaternion q;
		q.FromAngleAxis(angle,Vector3::UNIT_Y);

		for (int j=0;j<=numSegShape;j++)
		{
			const Vector2& v0 = shapeToExtrude->getPoint(j);
			Vector3 vp(v0.x,v0.y,0);
			const Vector2& vp2direction = shapeToExtrude->getAvgDirection(j);
			Vector2 vp2normal = vp2direction.perpendicular();
			Vector3 normal(vp2normal.x, vp2normal.y, 0);
			normal.normalise();
			if (shapeToExtrude->getOutSide() == SIDE_RIGHT)
				normal = -normal;

			addPoint(buffer, q*vp,
							 q*normal,
							 Vector2(i/(Real)mNumSeg, j/(Real)numSegShape));

			if (j <numSegShape && i <numSeg-1)
			{
				if (shapeToExtrude->getOutSide() == SIDE_RIGHT)
				{
					buffer.triangle(offset + numSegShape + 2, offset, offset + numSegShape + 1);
					buffer.triangle(offset + numSegShape + 2, offset + 1, offset);
				}
				else
				{
					buffer.triangle(offset + numSegShape + 2, offset + numSegShape + 1, offset);
					buffer.triangle(offset + numSegShape + 2, offset, offset + 1);
				}
			}
			offset ++;
		}
	}
}

	//-----------------------------------------------------------------------
	void Extruder::_extrudeBodyImpl(TriangleBuffer& buffer, const Shape* shapeToExtrude) const
	{
		assert(mExtrusionPath && shapeToExtrude && "Shape and Path must not be null!");
		unsigned int numSegPath = mExtrusionPath->getSegCount();
		unsigned int numSegShape = shapeToExtrude->getSegCount();
		assert(numSegPath>0 && numSegShape>0 && "Shape and path must contain at least two points");
				
		Real totalPathLength = mExtrusionPath->getTotalLength();
		Real totalShapeLength = shapeToExtrude->getTotalLength();
		
		// Merge shape and path with tracks
		Ogre::Real lineicPos=0.;
		Path path = *mExtrusionPath;
		if (mRotationTrack)
			path = path.mergeKeysWithTrack(*mRotationTrack);
		if (mScaleTrack)
			path = path.mergeKeysWithTrack(*mScaleTrack);
		if (mPathTextureTrack)
			path = path.mergeKeysWithTrack(*mPathTextureTrack);
		numSegPath = path.getSegCount();
		Shape shape = *shapeToExtrude;
		if (mShapeTextureTrack)
			shape = shape.mergeKeysWithTrack(*mShapeTextureTrack);
		numSegShape = shape.getSegCount();
		
		// Estimate vertex and index count
		buffer.rebaseOffset();
		buffer.estimateIndexCount(numSegShape*numSegPath*6);
		buffer.estimateVertexCount((numSegShape+1)*(numSegPath+1));
				
		Vector3 oldup;
		for (unsigned int i = 0; i <= numSegPath; ++i)
		{
			Vector3 v0 = path.getPoint(i);
			Vector3 direction = path.getAvgDirection(i);

			Quaternion q = Utils::_computeQuaternion(direction);
						
			Radian angle = (q*Vector3::UNIT_Y).angleBetween(oldup);
			if (i>0 && angle>(Radian)Math::HALF_PI/2.)
			{
				q = Utils::_computeQuaternion(direction, oldup);
			}
			oldup = q * Vector3::UNIT_Y;

			Real scale=1.;
					
			if (i>0) lineicPos += (v0-path.getPoint(i-1)).length();
			
			// Get the values of angle and scale
			if (mRotationTrack)
			{
				Real angle;
				angle = mRotationTrack->getValue(lineicPos, lineicPos / totalPathLength, i);

				q = q*Quaternion((Radian)angle, Vector3::UNIT_Z);
			}
			if (mScaleTrack)
			{
				scale = mScaleTrack->getValue(lineicPos, lineicPos / totalPathLength, i);
			}
			Real uTexCoord;
			if (mPathTextureTrack)
				uTexCoord = mPathTextureTrack->getValue(lineicPos, lineicPos / totalPathLength, i);
			else
				uTexCoord = lineicPos / totalPathLength;
			
			Real lineicShapePos = 0.;
			// Insert new points
			for (unsigned int j =0; j <= numSegShape; ++j)
			{				
				Vector2 vp2 = shapeToExtrude->getPoint(j);
				//Vector2 vp2direction = shapeToExtrude->getAvgDirection(j);
				Vector2 vp2normal = shapeToExtrude->getAvgNormal(j);
				Vector3 vp(vp2.x, vp2.y, 0);
				Vector3 normal(vp2normal.x, vp2normal.y, 0);							
				buffer.rebaseOffset();
				Vector3 newPoint = v0+q*(scale*vp);				
				if (j>0)
					lineicShapePos += (vp2 - shape.getPoint(j-1)).length();
				Real vTexCoord;
				if (mShapeTextureTrack)
					vTexCoord = mShapeTextureTrack->getValue(lineicShapePos, lineicShapePos / totalShapeLength, j);
				else
					vTexCoord = lineicShapePos / totalShapeLength;				

				addPoint(buffer, newPoint,
					q*normal, 
					Vector2(uTexCoord, vTexCoord));

				if (j <numSegShape && i <numSegPath)
				{		
					if (shapeToExtrude->getOutSide() == SIDE_LEFT)
					{
						buffer.triangle(numSegShape + 1, numSegShape + 2, 0);
						buffer.triangle(0, numSegShape + 2, 1);
					}
					else 
					{
//.........这里部分代码省略.........